Staff Member

As you mentioned, this behavior is associated with the dormant service functionality for cpsrvd in version 56. Per our documentation:

This setting configures the system to unload idle services from memory after up to ten minutes of inactivity, and then loads listening devices that correspond to it. This setting reduces memory usage, but delays responses from dormant services. When you enable this setting for a service, that service will immediately enter dormant mode whenever you reboot your server or restart the service.

Thus, this is why you see log output like this in /usr/local/cpanel/logs/error_log whenever the service exits out of dormant mode: